Lens-fastening.



F. H. KAHN. LENS FASTENING. APPLICATION FILED-AUG. 28, 1914.

Patnted Feb. 2. 1915 ST'IES LENS-FASTENING.

Specification of Letters Patent.

Patented Feb. 2, 1915.

Application filed August 28. 1914. Serial No. 859,089.

To all whom it may concern:

.Be it known that I, Fnuxnnno H. KAHN, a citizen of the United States,and resident of San Francisco, in the county of San Francisco and Stateof California, have-invented certain new and useful Improvements inLens-Fastenings, of which the following is a specification.

This invention relates to means for preparing lens blanks for'inountingpurposes, and it consists in the main of means whereby a metal plug maybe incorporated in a lens blank, in order that by this means a metalbearing may be provided in and aboutsaid orifice to receive the screw orrivet whereby the mount is secured to the lens, to provide rigidsurfaces within the lens whereby said mounting screw or rivet may besecurely tightened without risk of fracturing the lens.

One form of my invention consists in the provision of an orifice in alens blank in the appropriate position, said orifice converging inwardlyfrom opposite sides of the blank, filling said orifice with molten metalwhich thus becomes fused within said orifice, and, due to theconstricted character of the orifice is securely anchored therein. Alens blank thus equipped is then properly shaped,

ground and polished and the metal plug therein is drilled axially withthe hole to receive the usual mounting screw or rivet, which latter maythen be secured tightly with the metal plug as a solid unbreakablebearing therefor.

In another form of my invention a metal plug of the desired shape may beplaced in a suitable mold and molten glass may then be poured into saidmold about said plug for the molded production of a lens blank with pluginsertion, the lens being shaped, ground and polished subsequently. Theplug, which is preferably of metal, but may obviously be of othersuitable material may be so externally shaped or notched as to beincapable of rotating in its lens orifice or bearing.

Other features and advantages will appear hereinafter.

In the drawing accompanying this applition: Figure 1 is a plan view of arough lens blank, having a metal plug. Fig. 2 is a cross sectional viewof Fig. 1 taken through the plug. Fig. dis a cross sectional View. of alens that has been shaped and finished from the aforesaid blank, with ahole drilled axially through the plug, and Fig. & is a plan view of Fig.3. Fig. 5 is a detail of a lens having an orifice with centering spursto fit in peripheral notches in the plug and hold said plug against rotation. Fig. 6 is a similar view showing an oval orifice with oval plugtherein for a s milarpurpose. Fig. 7- is a cross sectional view showinga one sided strap for-connection with the lens, and Fig. 8 is a similarview showing a usual form of strap applied to the lens.

In carrying out my invention, I take an ordinary lens blank, such asshown in Figs. 1 and 2 and provide near the edge thereof a transverseorifice a of are-.1 greater than is usual for the reception of amounting screw or rivet. Said orifice is preferably constructed as seenfrom opposite sides of the blank, and is filled in any suitable mannerwith a metal plug which may be produced therein by pouring molten metalinto said orifice, becoming fused therein, the constricted characted ofthe orificecausing it to provide an anchorage to retain the plugtherein, preventing it from becoming dislodged at either side of theblank. The metal employed for this purpose may be of such melting pointthat in a molten state it may with safety be filled into the orificewithout'liability of splitting or damaging the lens, and'the expedientmay be resorted to of raising the temperature of the lens toapproximately the temperature at which the metal is introduced in amolten state to the same end. \Vith a metallic plug introducedin thelens blank, the latter may be treated in the usual manner in shaping,grinding and polishing the lens, and at any desired stage in theoperation the metallic plug therein may be drilled with a. hole, as b,to provide the usual orifice threaded or otherwise for the reception ofa mounting screw, rivet or other fastening pin. The finished lens withits metallic plug .1511 bearing will be free from the usual liability ofdamaging the lens when tightening up the mounting screw, or performing ariveting operation whereby the lens may be so securely attached to itsmount as to be free from the danger of the connection becoming loose.

It is well knownthat when pinning the usual strap to a lens by means ofa mounting screw, the joint cannot be tightened up beyond a certainpoint as'the pressure in so r a a like purpose.

t Wlille I havedescribed the plug as. formed in the'lens blank bypouring molten. metal therein-tit is'equally obvious that'the processmay'be reversed and the lens blank produced by -molding 'itabout a.formed; plug, the re connector:

doing would cause the leiis'to fly, 'but this improvement whereby ametallic bear:

ing of suflicient"ala -is'furnished,it will be 'quite evident that thetightening ean be 1 '5- efficiently performed and the mount renderedperfectly. secure. v "-'As shown in"Fig 5' the orifice in the lens mayhave intruding spurs son-projections 0 whereby, when the plu as cl isformed 1,0 ltherein' said plug will be lneapable of looseningby'rotation. Or, as in Fig; 6 the orifice -may beof oval or other;irregular shape for s'ult's being the'f' same in .both instances; Inthellatter'ease the plug may if desired be drilled and threaded beforethe lens blank jfir ledaboutiti the d vantages' 'of the'rigid bear:which the metal or other plug affords for-the mount-is that thescrew orother fasmay besofirmly secured therein that jllestrap'isnot-require'd'to extend ,over both sidesef. "the lens.'Thusg'inFig. 7 I show a.

"-arapf whichf v y onesidefi adwhich may befiinne'ri side of the lens,next tlle' outer side exposing only-the plug and clio'rag'e'j I I "f ,2.A lens having a transverse orifice, 1n-

' wardlyconstricted from; opposit i orifice containing a [metallic plug"fused therein to form, a permanent bearingpor- 'tifdn and axially'pie'rced to receive a *mount f z. 17 hi3. A lens having a transverseorificet'pernian'entl'y oonstricted inwardlyfl from oppobo'sitesides,said orifice conta' ing a metallicfplug therein, said ug' at o positesides forming bearing surfaces'by-w ichto secure a" mount.

fl. The mahdd' of making lenses for eyeglasses and the like consistingin forming an enlarged orifice transversely throughv said. blank, fusinga metallic 'plug in said tion, shaping, grinding, and finishing theblank in lens form, and forming a threadin vsaid orifice to receive amount supporting screw. I

5', A lens having a transverse orifice inorifice to form a permanentbearing porv wardlyconstricted from opposite sides and a plug ofrelatively infrangible', material molded therein to:formaninterlockingpermanent anehora'ge.-

-6. A' lens having a transverse orifice inwardly constricted fromopposite sides and a .plug of relatively infrangible material therein,one of said elements having molded engagement -with the other to,efi'ect'an in terlockingpermanent union. I

7. 'The-eombination with a lens having a plug I of -relatively rinfrangible I unyielding material biperm'anently held therein, of amount strap extending over oneside only o-fsaid lens, and meansconnectingsai'd strap with said plug,

8. In eombmatron,"a lens having -an-intermediately constrictedtransverse aperture therein; and a plug of relatively'infrangible,

unyielding material m'olded within said orifice toiieompriseifapernianently anchored bear ing portion of said lens, said plug-beinglpene'trated with a threaded orifice-t0 engage a mountscrewrsubstantially throughout ltsextent. v v a I t 9. A lens whichdlasbeen shaped, ground and polished from a blank provided with atransverse= orificeinwardly constricted from opposite sides, saidorifice havingp molded therein-a permanent bearing portion in the formof a plug of, relatively'mfrangible, unyielding material whoseexposedsurfaces lie in the radius of curvature of the finished lens, said plugbein'g a xially pierced and threaded to engage a mount awsubstantiallythroughout its extent;

{Si ed at SanFrancisco in the county of 'San %rancisco and StateofCalifornia this 8th dayof August A. D. 1914.

- f FERNANDO H. KA'HN.

Witnesses:

' K. DAGGETT, J, HrBRUNNsR.

